Front-End electronics for Future Linear Collider calorimeters C. de La Taille IN2P3/LAL Orsay On behalf of the CALICE collaboration Slides from JC Brient, S. Blin, C. Jauffret, J. Fleury, G. Martin-Chassard, N. Seguin-Moreau, L. Raux, F. Sefkov

20 oct 2006C. de La Taille front-end electronics for ILC calorimeters. EUDET annual meeting 2 ECAL TCMT HCAL CALICE Testbeam at CERN SPS Common DAQ 18’000 ch ECAL HCAL

20 oct 2006C. de La Taille front-end electronics for ILC calorimeters. EUDET annual meeting 3 Next steps FLC_PHY3 (2003) HaRD_ROC (2006)

20 oct 2006C. de La Taille front-end electronics for ILC calorimeters. EUDET annual meeting 4 Technological prototype : “EUDET module” Front-end ASICs embedded in detector Very high level of integration Ultra-low power with pulsed mode FLC_TECH1 ASIC prototype in 0.35 µm SiGe All communications via edge 4,000 ch/slab, minimal room, access, power small data volume (~ few 100 kbyte/s/slab) « Stitchable motherboards » Elementary motherboard ‘stitchable’ 24*24 cm ~500 ch. ~8 FE ASICS

20 oct 2006C. de La Taille front-end electronics for ILC calorimeters. EUDET annual meeting 5 EUDET : ECAL emodule Electromagnetic calorimeter Prototype of a (~ 1/6) module 0 : one line & one column 150 cm long, 12 cm wide 30 layers channels Test full scale mechanics + PCB Can go in test beam Test full integration + edge communications Similar in #channels as physics prototype ©M. Anduze (LLR)

20 oct 2006C. de La Taille front-end electronics for ILC calorimeters. EUDET annual meeting 6 EUDET module FEE : main issues Mixed signal issues Digital activity with sensistive analog front-end Pulsed power issues Electronics stability Thermal effects To be tested in beam a.s.a.p. No external components Reduce PCB thickness to < 800µm Internal supplies decoupling FE chip (1mm) Wafer (400µm) PCB (600µm) Tungsten (1 mm)

20 oct 2006C. de La Taille front-end electronics for ILC calorimeters. EUDET annual meeting 7 ECAL Front-End ASIC Power Cycling Auto-trigger on ½ MIP Internal ADC Readout integration is the key element of compact detector Keep small Moliere radius for good shower separation Many features have never been used before e.g. power cycling (ON 2ms OFF 200 ms)

20 oct 2006C. de La Taille front-end electronics for ILC calorimeters. EUDET annual meeting 8 HaRDROC architecture Full power pulsing Digital memory: Data saved during bunch train. Only one serial output Store all channels and BCID for every hit. Depth = 128 bits Data format : 128(depth)*[2bit*64ch+32bit(bcid)+8bit(Header] = 20kbits Sequential 100 MHz : 20k* 10 ns = 200 µs (read up to 1000 chips/inter bunch) 64 INPUTS 1 OUTPUT Transfered to DAQ during Inter-bunch Hold: Ext signal or OR output Variable Gain Preamp. Variable Slow Shaper ns S&H Bipolar Fast Shaper Gain correction 64*6bits G=0 to 4 2 discri thresholds (2*10 bits) 2 DACs 10 bits Latch Vth1 - Vth0 - -Vth1 -Vth0 OR trig1 trig0 Multiplexed Analog charge output trig1 WR S R A M 128 * bit counter BCID

20 oct 2006C. de La Taille front-end electronics for ILC calorimeters. EUDET annual meeting 9 HaRDROC layout 64 inputs, 1 data output Vss of the analog, mix and digital part separated 180 pads 64 Analog Channels Digital memory Control signals and power supplies Dual DAC Bandgap Discris

20 oct 2006C. de La Taille front-end electronics for ILC calorimeters. EUDET annual meeting 10 MAROC Efficiency curves

20 oct 2006C. de La Taille front-end electronics for ILC calorimeters. EUDET annual meeting 11 Acquisition mode Store upto 128 events in RAM Stop acquisition when ram_full signal asserted Common collector bus for ram_full signal

20 oct 2006C. de La Taille front-end electronics for ILC calorimeters. EUDET annual meeting 12 Readout mode Token ring mechanism initiated by DAQ Possibility to bypass a chip by slow control One data line activated by each chip sequentially Readout rate few MHz to minimize power dissipation With 500 pF bus capacitance, power dissipation is ~10uW/chip i=CdV/dt = 1 mA => 1 mW for up to 100 chips on bus Readout time max (ram full) 10kbit * 1 µs = 10 ms/chip

20 oct 2006C. de La Taille front-end electronics for ILC calorimeters. EUDET annual meeting 13 EUDET ECAL ASIC 72 channels Scales with the 4 factor reduction in pad size and is compatible with physics prototype Detector DC coupling Prepares the case the on-detector MMIC HV capacitance is not affordable Provides leakage current monitoring, up to 1 µA/Ch Auto-trigger If one channel is hit during a bunch crossing, then the whole chip is recorded with a time tag (BCID) The auto trigger activates the T&H Analogue pipeline, ADC & digital registers 8-depth analog pipeline to store « in bunch » events Wilkinson 12 bit 100MHz ADC On chip storage, inter-bunch data outputting Digital data output Daisy chained with redundancy : one output for 40 ASICs Common architecture for ECAL and HCAL

20 oct 2006C. de La Taille front-end electronics for ILC calorimeters. EUDET annual meeting 14 General block scheme Ch. 0 Ch. 1 Analog channel Analog mem. 72-channel Wilkinson ADC Analog channel Analog mem. Ch. 71 Analog channel Analog mem. Bunch crossing 24 bit counter Time digital mem. Event builder Memory pointer Trigger control Main Memory SRAM Com module ECAL SLAB

20 oct 2006C. de La Taille front-end electronics for ILC calorimeters. EUDET annual meeting 15 One channel

20 oct 2006C. de La Taille front-end electronics for ILC calorimeters. EUDET annual meeting 16 Time considerations time Time between two trains: 200ms (5 Hz) Time between two bunch crossing: 337 ns Train length 2820 bunch X (950 us) Acquisition 1ms (.5%) A/D conv..5ms (.25%) DAQ.5ms (.25%) 1% duty cycle IDLE MODE 99% duty cycle 199ms (99%)

20 oct 2006C. de La Taille front-end electronics for ILC calorimeters. EUDET annual meeting 17 HCAL architecture Typical layer 2m tiles 38 layers tiles FEE: 32 ASICs (64-fold) 4 readout lines / layer Layer data Concentrator (control, clock and read FEE) Module data concentrator Instrument one tower (e.m. shower size) + 1 layer (few 1000 tiles) To DAQ EUDET: Mechanical structure, electronics integration: DESY and Hamburg U

20 oct 2006C. de La Taille front-end electronics for ILC calorimeters. EUDET annual meeting 18 Prospective for A-HCAL SiPM Chip Similar developments for AHCAL Chip fully dedicated to SiPMs developped after ECAL chip Internal DAC for SiPM gain adjustment (5V range) Auto-trigger (fast shaper + Discriminator) Internal TDC, 1 ns step Internal 12 bit ADC Power pulsing T&H x1 Variable gain Preamplifier Discri TDC 12-bit ADC 8 bit DAC (0-5V) in Fast Shaper Shaper t p ~30-40ns Auto-trigger 12-bit DAC Threshold Capacitance for AC coupling … Analogue Memory Charge Ouput Time Ouput

20 oct 2006C. de La Taille front-end electronics for ILC calorimeters. EUDET annual meeting 19 Conclusion Second generation calorimeter ASICS being designed Power pulsing, Zero-suppress, Auto-trigger… HArDROC for DHCAL Readout submitted sept 06 First EUDET milestone passed ECAL chip to be submitted in nov 06 AHCAL SiPM ASIC to be submitted in mar 07 System aspects to progress in parallel “Stitchable” PCBs for large module Second generation DAQ Low power low cost essential target